Cognomen Datsy (Даци 
, Datsy 
, Даций 
) , all around the world, is a rare family name. The family name Datsy is characteristic of Azerbaijan, where it is quite a rare surname, Bulgaria, where it is a rare surname, and Russia. Measured by absolute frequency, it is commonest in Russia, Azerbaijan, and Ukraine. Much less frequently, Datsy is the forename as well as the last name.